could focus
Regular verb: focus - focused- focused

Affirmation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could focus
you could focus
she could focus
we could focus
you could focus
they could focus 	I could be focusing
you could be focusing
she could be focusing
we could be focusing
you could be focusing
they could be focusing	I could have focused
you could have focused
she could have focused
we could have focused
you could have focused
they could have focused	I could have been focusing
you could have been focusing
she could have been focusing
we could have been focusing
you could have been focusing
they could have been focusing	

Negation 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
I could not focus
you could not focus
she could not focus
we could not focus
you could not focus
they could not focus 	I could not be focusing
you could not be focusing
she could not be focusing
we could not be focusing
you could not be focusing
they could not be focusing	I could not have focused
you could not have focused
she could not have focused
we could not have focused
you could not have focused
they could not have focused	I could not have been focusing
you could not have been focusing
she could not have been focusing
we could not have been focusing
you could not have been focusing
they could not have been focusing	

Interrogative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I focus?
could you focus?
could she focus?
could we focus?
could you focus?
could they focus? 	could I be focusing?
could you be focusing?
could she be focusing?
could we be focusing?
could you be focusing?
could they be focusing? 	could I have focused?
could you have focused?
could she have focused?
could we have focused?
could you have focused?
could they have focused? 	could I have been focusing?
could you have been focusing?
could she have been focusing?
could we have been focusing?
could you have been focusing?
could they have been focusing? 	

Interro-negative form 	
Simple form 	V-ing form 	Perfect 	V-ing perfect 	
could I not focus?
could you not focus?
could she not focus?
could we not focus?
could you not focus?
could they not focus? 	could I not be focusing?
could you not be focusing?
could she not be focusing?
could we not be focusing?
could you not be focusing?
could they not be focusing? 	could I not have focused?
could you not have focused?
could she not have focused?
could we not have focused?
could you not have focused?
could they not have focused? 	could I not have been focusing?
could you not have been focusing?
could she not have been focusing?
could we not have been focusing?
could you not have been focusing?
could they not have been focusing?